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Braking
See Brake System Warning Light on
page 3-31.
Braking action involves perception
time and reaction time. Deciding
to push the brake pedal is
perception time. Actually doing
it is reaction time.
Average reaction time is about
three-fourths of a second. But that
is only an average. It might be
less with one driver and as long as
two or three seconds or more with
another. Age, physical condition,
alertness, coordination, and eyesight
all play a part. So do alcohol, drugs,
and frustration. But even in
three-fourths of a second, a vehicle
moving at 60 mph (100 km/h) travels
66 feet (20 m). That could be a lot
of distance in an emergency, so
keeping enough space between the
vehicle and others is important.
And, of course, actual stopping
distances vary greatly with the
surface of the road, whether it is
pavement or gravel; the condition of
the road, whether it is wet, dry, or icy;
tire tread; the condition of the brakes;
the weight of the vehicle; and the
amount of brake force applied.
Avoid needless heavy braking. Some
people drive in spurts — heavy
acceleration followed by heavy
braking — rather than keeping pace
with traffic. This is a mistake. The
brakes might not have time to cool
between hard stops. The brakes will
wear out much faster with a lot of
heavy braking. Keeping pace with
the traffic and allowing realistic
following distances eliminates a lot of
unnecessary braking. That means
better braking and longer brake life.
If the engine ever stops while
the vehicle is being driven, brake
normally but do not pump the brakes.
If the brakes are pumped, the pedal
could get harder to push down. If the
engine stops, there will still be some
power brake assist but it will be used
when the brake is applied. Once the
power assist is used up, it can take
longer to stop and the brake pedal
will be harder to push.
Adding non-dealer/non-retailer
accessories can affect vehicle
performance. See Accessories and
Modifications on page 5-3.
Driving Your Vehicle 4-5